Device for holding cutting tools



P 1930- H. E. ELLIOTT DEVICE FOR HOLDING CUTTING EOOLS Filed March 19, 1925 /NVE NTUR Patented Sept. 23, 1930 UNITED STATES PATENT" OFFICE HAROLD ELRN EST ELLIOTT, OF LEICESTER, ENGLAND, ASSIGNOR TO UNITED SHOE MA- CHINERY CORPORATION, JERSEY OF PATERSON, NEW JERSEY, A CORPORATION OF NEW DEVICE, FOR HOLDING CUTTING .troons Application filed March 19, 1e25, Serial no.

This invention relates to devices forhold ing cutting tools and is herein illustrated as embodied in a device of the general type disclosed in United States Letters Patent No. 1,662,905, granted March 20, 1928, upon application of T. H. Seely and L. W. Rollins. The device disclosed in the patent above referred to comprises sections adapted to be brought together and to grip a cutting tool and retain it in position for the convenient performance of filing or other abrading operation on the tool, the sections being formed with templet faces for guiding the file or other abrading element to control the abrading operation. These devices are especially designed to hold tools having oppositely beveled faces forming chisel-like cutters, such as certain common types of sewing machine awls. In the use of such holders or fixtures it is important that the tool to be sharpened occupy a favorable position from the standpoint of the convenience of the operative to facilitate accurate work.

In view of these considerations it is an obi ject of this invention to provide an improved fixture of the type above mentioned by the employment of which the sharpening of cut-- ting tools will be still further facilitated without sacrificing any advantages characteristic of such devices. In various respects, however, the invention is not limited to incor oration in a device of this type.

*or the attainment of this object the present invention provides, in accordance with one feature, a fixture for supporting a curved awl while it is being sharpened, the fixture comprising a holder arranged for oscillation about an axis so positioned that a line'tangent to the curved axis of the awl at the point of the awl will lie in the same plane as the axis of oscillation when the awl is in any one of a plurality of positions. Preferably, the surfaces to be sharpened are successively positioned face up in substantially the same horizontal plane. Thus theoperative may look directly down upon his work thereby facilitating convenience and accuracy of operation.

In the illustrated embodiment of the invention a support or fixture, especially designed 16,848, and in Great Britain April 5, .1924. I

to position and hold the oppositely beveled faces of a sewing machine awl of the type referred to',is so constructed and arran ed that these surfaces may be brought one after another into the desired position merely by rotative movement of the work-holding means. This organization permits the operative to position the awl to be ground to the best advantage readily and without appreciable loss of time and obviates the liability of performing sharpening operations awkwardly and inaccurately or otherwise disadvantageously.

These and other features and advantages of the invention will appear from a consideration of the following specification and drawings of the illustrative construction in which Fig. 1 is a side elevational. View of the fixture;

Fig. 2 is a plan view of the mechanism shown in Fig. 1, showing in dotted lines the work holder in inverted position; and

Fig. 3 is'a front elevational view of the mechanism shown in Fig. .1 also showing in dottedlines the work holder in inverted position.

The numeral 10 indicates a casting or body member adapted to besecured to a support 12 by means of :a: set-screw 14. This body member contains a bore 16 disposed at an angle to the horizontal, the purpose of which disposition will be hereinafter explained.

Mounted within the bore for rotation therein is a member comprising a head 18 and cylindrical shank 20 formed integral therewith. The shank member 20 is bored diametrically close to the head 18 to receive a pin 30 of which theends' engage a pair of slots 28 located in the body member 10. site end of the shank member from the pin a compression spring 24'is confined within At the oppoiii) an enlarged portion 26 of the bore by a collar 22 fast upon the end of theshank 20. 1th the" end of the slots 28 the shank part is locked in one of twopositions. The rotary member may be pulled out by hand against thepressure of the spring 24; so that the pin 30 is freed from the slots 28 and then the rotary member pin 30 engaged in the a laterally extending pin 41 and a hollow' depression 39. The clamping block 34 is provided with a bore 38 adapted to be inserted over the shoulder pin 41 and this clamping block also carries a projecting pin 36 adapted for engagement with the depression 39. A shoulder screw 40 extends through the clamping members and has screw-threaded engagement with the head to control adjustment of the clamping members relatively to each other. As shown in Fig. 3, the opposite interior faces of the clamping members are provided with grooves formed to correspond to and to receive the corners or edges of the cutting tool while in its inserted position. The shoulder pin 41 provides means to prevent the lowermost part of the clamping members from collapsing upon clamping pressure being applied by means of screw 40. A spring 42 surrounds the screw 40 and engages the opposite interior faces of the clamping members to insure their release from the cutting tool upon the relaxing of the clamping pressure.

Each of the clamping members 32 and 34 is provided with a similarly disposed pointed wedge-shaped projection or ridge 44 through one end of which the groove for holding the cutting tool 50 is continued. The faces 46 and 48 of each ridge are disposed at an angle equivalent to the angle that it is desired to impart tothe cutting edge. These faces form abrader-guiding surfaces and in the position illustratedin Fig: 1 it will be seen that the fixture has been constructed in such a manner that the faces 48 are disposed in a horizontal plane facing upwardly. To insure that, upon rotating the shank member 20 through 180 degrees, the second pair of guide surfaces 46 will also be located in substantially a hori zontal plane facing upwardly, the axis of the shank or rotating member 20 is disposed at an angle to the horizontal equal to one half the angle that it is desired to impart to the cutting edge and consequently at'an angle equal to one half the angle between the beveled faces of the ridge or wedgeshaped projection 44.

The rotary member being first held by the spring-controlled pin-and-slot connection. in a position such that one of the abrader-g'uid ing surfaces is horizontal, as above indicated, one of the bevels of the cutting tool 50 may be trued in full and convenient view of the To enable the cutting tool held-in 3 the clamping blocks freely to clear the body member as it rotates between either of its two positions, the clamping members are offset from the axis of rotation. It will be seen, then, that in either position of the device as illustrated the cutting tool is held for treatment in a position such that the line tangent to the curved axis of the awl at its point and bisecting the angle formed at its pointed end lies in the plane of the axis of the shank of the rotary member and vertiially level with but horizontally oifsetthererom.

' Having thus described my invention, what I claim as-new and desire to secure by Letters Patent of the United States is:

1. In an awl-supporting fixture,a work holder having a two-part angular ridge forming guiding surfaces, said holder being mounted for oscillatory movement, and means for holding a curved awl between the parts of the ridge in such a position that a line bisecting the angle formed at its pointed end, and tangent tothe curved axis of the awl, lies in the same plane as the axis of oscillation of the holder and is horizontally offset therefrom. I

2. In'an awl supporting fixture, a holder for a curved awl, means for clamping an awl in the holder, a fixed axis about which the holder may oscillate, and means for securing the holder in any one of a plurality of positions into which it may be oscillated, each of said positions of the holder so positioning the awl that a' line tangent to the curved axis of the awl. at the point of theawl willbe in the same plane as the axis of oscillation.

3. In an awl supporting fixture, a holder for a curved awl, means for clamping an awl in the holder, a fixed axis about whichthe holder may oscillate, and means for securing the holder in either one of two diametrically opposite positions into whichit may be oscillated, the parts being so constructed'and arranged that a line tangent to thewcurved axis of the awl at the point of the awl when the awl is in one of said positions, a similar line when the awl is in the other position, and the axis of oscillation, all lie in the same plane. j I

In testimony whereof I have signed my name to this specification.

HAROLD ERNEST ELLrorr. 

